Environment: Menacing Mosquitoes

DDT is now widely indicted for killing wildlife and endangering man, but the latest charge has a reverse twist. In California, which is afflicted with 43 kinds of mosquitoes, two species have become virtually immune to DDT plus all other available insecticides.

The worst of the pests is the female pasture mosquito (Aëdes nigromaculus). Though it does not transmit diseases to man, the creature is a vicious stinger and travels in swarms as dense as 2,000,000 per acre in Southern California. In parts of the San Joaquin Valley, the pests are so thick at...

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